Enter the values used by roas
Calculate return on ad spend from attributed revenue and advertising cost. Enter the assumptions for the same time period and currency, and check any minimum or maximum values displayed next to the input fields.
Attributed revenue, Ad spend.
Change one variable so you can see the effect without mixing several assumptions.
The worked example below shows the formula and the independently rendered default-input results.
Calculate roas from sample inputs
These are the same starting values loaded into the interactive calculator above. The displayed results below come from the same calculation engine as the live tool.
Step 1 — Record the inputs
Step 2 — Identify the formula
Step 3 — Substitute the values
For this exact worked case, use Attributed revenue = $8,000; Ad spend = $2,000. Replace named formula variables with their input values as shown below. Keep the units consistent; a percent is divided by 100 wherever the model requires a decimal rate.
Step 4 — Read the calculated answer
Rounding follows the calculator display: whole units may be rounded up when an indivisible unit is required, while other values typically show up to two decimal places. The result is conditional on the entered assumptions, not a market quotation.
How to interpret this roas result
ROAS is a revenue-to-ad-spend ratio, not a profit margin. Include product cost, fees, returns and other campaign costs in the decision.
Tie the metric to a single campaign period and attribution definition. Compare traffic quality and contribution rather than ranking campaigns on the headline figure alone.
Scenario comparison
Test lower conversion or yield while keeping spend constant, then test a higher-cost acquisition scenario.
Assumptions and limitations
Attribution windows, reporting delays and data filtering can change marketing measures without changing the underlying sale.
- Attributed revenue: Enter a finite monetary value of at least 0. Use a consistent definition across comparison cases.
- Ad spend: Enter a finite monetary value of at least 0. Use a consistent definition across comparison cases.
Frequently asked questions
What does this calculator include?
It uses the named inputs above and the formula shown in the worked example. No other fees, revenue streams, or external data are automatically included.
Why could my real result be different?
Attribution windows, reporting delays and data filtering can change marketing measures without changing the underlying sale.
How should I compare two results?
Test lower conversion or yield while keeping spend constant, then test a higher-cost acquisition scenario. Record the assumption that changed so a higher or lower answer is interpretable.
ROAS calculation method
ROAS is a revenue-to-ad-spend ratio, not a profit margin. Include product cost, fees, returns and other campaign costs in the decision.
What this estimate does—and does not—include
This tool is designed for quick planning and comparison. For tax, accounting, legal, investment, lending, or other regulated decisions, verify the result against the rules and assumptions that apply to your situation.
CalcScoutHQ shows the calculation logic so you can check assumptions, understand the result, and reproduce the math independently when needed.
Benchmark context
ROAS measures attributed revenue against ad spend, not profit. A high ratio can still lose money when product cost, discounts, fees, returns and incremental versus existing demand are ignored.
Decision case
An ecommerce campaign with lower ROAS may create more contribution if it sells higher-margin products and attracts customers who repeat, but that conclusion needs cohort evidence.
Calculation mistakes that change the conclusion
- Using platform-attributed revenue as certain incrementality
- Comparing channels with different attribution windows
- Ignoring agency and creative cost
Evidence to review next
- Contribution after fulfillment and returns
- New-customer share
- Cohort repeat behavior and cash payback